Migrate against synnefo.settings backend by default
use ``PITHOS_BACKEND_DB_CONNECTION`` as default value for alembic sqlalchemy.urloption.
Pithos alembic migration wrapper tool
Remove index on cluster
Refs: #2675
Write more realistic tests
Introduce alembic
eliminate nested sql aggregations
Call for delete container contents
Refs: #2611
Fix size & type of copied objects (sqlite)
Fix size & type of copied files
change backend to raise custom exceptions
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